Clean Water Act discharge permit · NPDES MAR10064N

ALNYLAM NORTON- GMP EXPANSION, Norton, MA: NPDES MAR10064N discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
0Pollutants under a numeric limit
0Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

ALNYLAM NORTON- GMP EXPANSION, held by Commodore Builders LLC, holds NPDES permit MAR10064N. EPA’s file records it issued January 16, 2026 and expiring February 16, 2027.

ALNYLAM NORTON- GMP EXPANSION, Norton, Massachusetts: Coverage under a general permit MAR10064N, held by Commodore Builders LLC; Construction stormwater; Effective; issued January 16, 2026, term to February 16, 2027, by U.S. EPA.

Massachusetts holds 3,320 Construction stormwater coverages of this permit type in EPA’s file; 2,822 were issued before MAR10064N.

Coverages issued nearest MAR10064N

January 12, 2026: FERNCROFT COUNTRY CLUB BUILDING ADDITIONS & SITE IMPROVEMENTS, Middleton, MAR10064S, held by Northpoint Construction Management
January 12, 2026: 124 WESTBORO ROAD, Grafton, MAR10064T, held by Westboro Road Property Owner, LLC
January 12, 2026: CWSRF 16705 C. NAUGHTON CORP: SWANSEA, MA - RT 6 CORRIDOR SEWER, Swansea, MAR10064U, held by C. Naughton Corp.
January 13, 2026: OVERLOOK PARK RENOVATION PROJECT, Burlington, MAR10064E, held by M.J. Cataldo, Inc.
January 13, 2026: 939 SOUTHBRIDGE STREET REPAVING AND GARAGE EXPANSION, Worcester, MAR10064P, held by Massachusetts Electric Company
January 16, 2026: BRIDGE REPLACEMENT, M-05-001=W-06-013 & W-06-016,ROUTE 6 OVER WEWEANTIC RIVER, Wareham, MAR10064R, held by Northern Construction Service, LLC
January 19, 2026: WADING RIVER WATER TREATMENT PLANT, Mansfield, MAR10064Q, held by Daniel O'Connell's Sons, Inc
January 19, 2026: THE COUNTRY CLUB - ACCESS ROAD & CLUB HOUSE ADDITIONS & GEOTHERMAL WELLS, Chestnut Hill, MAR10064X, held by Consigli
January 19, 2026: MEDFIELD STATE HOSPITAL OFF-SITE INTERSECTION IMPROVEMENTS, Medfield, MAR100650, held by Woodall Construction Co. Inc.
January 20, 2026: HILLSIDE SUBSTATION NO. 66, Amesbury, MAR10064V, held by Massachusetts Electric Company

ALNYLAM NORTON- GMP EXPANSION among its neighbors

EPA’s permit file holds 33 discharge permits in the Mill River subwatershed (HUC 010900040801), MAR10064N among them. Its county holds 223, 13 of them major permits; MAR10064N is a minor permit.

Other permits in the Mill River subwatershed (HUC 010900040801)

0 BAY STREET, Taunton: MAR1004CA, minor permit, permit term to February 16, 2027
2318 & 0 BAY STREET TAUNTON, MA, Taunton: MAR100590, minor permit, permit term to February 16, 2027
299 SOUTH WASHINGTON ST PROPOSED BUILDING, Norton: MAR1005L3, minor permit, permit term to February 16, 2027
306-308 EAST MAIN STREET, Norton: MAR100484, minor permit, permit term to February 16, 2027
ABBIE ESTATES DEFINITIVE SUBDIVISION, Foxborough: MAR1005FP, minor permit, permit term to February 16, 2027
CORRIDOR IMPROVEMENTS AND RELATED WORK ON BROADWAY (ROUTE 138), Taunton: MAR1005LD, minor permit, permit term to February 16, 2027
COYLE SCHOOL RESIDENCES, Taunton: MAR1004LI, minor permit, permit term to February 16, 2027
EASTON LIQUIFIED NATURAL GAS OVER-PRESSURIZATION STATION, Easton: MAR1005GA, minor permit, permit term to February 16, 2027
EASTON LIQUIFIED NATURAL GAS PLANT IMPROVEMENTS, Easton: MAR10052N, minor permit, permit term to February 16, 2027
GILBERTA WAY, Easton: MAR10049C, minor permit, permit term to February 16, 2027

What the register holds for ALNYLAM NORTON- GMP EXPANSION: its NPDES ID, its permit type and status, its dates, its address in Norton, Massachusetts. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES MAR10064N.

Identity

Facility as filed	ALNYLAM NORTON- GMP EXPANSION
Permittee as filed	Commodore Builders LLC
NPDES ID	MAR10064N
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Program	Construction stormwater
Issued	January 16, 2026
Expiration date	February 16, 2027
Issuing agency	U.S. EPA
Address	Norton, MA 02766
Subwatershed	Mill River (HUC 010900040801)
Other EPA IDs (FRS)	RCRA handler MAR000570465; ICIS-AIR source MA0000002512001200

Effluent limits and exceedances

0Pollutants on file
0Under a numeric limit
0With a violation of any kind
0With an effluent exceedance

EPA’s limits and effluent violation files hold no pollutant row for NPDES MAR10064N.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES MAR10064N.

Inspections

EPA’s inspection file holds no inspection for NPDES MAR10064N.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES MAR10064N.

Watch this permit

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

['Of the 36 storm water construction permits in Bristol County, 0.0% carry a violation on file, and ALNYLAM NORTON- GMP EXPANSION is among them.', 'The Mill River subwatershed lists 33 NPDES permits, including this permit.', 'Across the 36 storm water construction permits in Bristol County, including this permit, 86.1% were issued before it.']